# A more general model for the intrinsic scatter in Type Ia supernova distance moduli

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**A more general model for the intrinsic scatter in Type Ia supernova distance moduli.** / Marriner, John; Bernstein, J. P.; Kessler, Richard; Lampeitl, Hubert; Miquel, Ramon; Mosher, Jennifer; Nichol, Bob; Sako, Masao; Schneider, Donald P.; Smith, Mathew.

Research output: Contribution to journal › Article › peer-review

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*The Astrophysical Journal*, vol. 740, no. 2, pp. 72. https://doi.org/10.1088/0004-637X/740/2/72

### APA

*The Astrophysical Journal*,

*740*(2), 72. https://doi.org/10.1088/0004-637X/740/2/72

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TY - JOUR

T1 - A more general model for the intrinsic scatter in Type Ia supernova distance moduli

AU - Marriner, John

AU - Bernstein, J. P.

AU - Kessler, Richard

AU - Lampeitl, Hubert

AU - Miquel, Ramon

AU - Mosher, Jennifer

AU - Nichol, Bob

AU - Sako, Masao

AU - Schneider, Donald P.

AU - Smith, Mathew

PY - 2011/10/20

Y1 - 2011/10/20

N2 - We describe a new formalism to fit the parameters α and β that are used in the SALT2 model to determine the standard magnitudes of Type Ia supernovae (SNe Ia). The new formalism describes the intrinsic scatter in SNe Ia by a covariance matrix in place of the single parameter normally used. We have applied this formalism to the Sloan Digital Sky Survey Supernova Survey (SDSS-II) data and conclude that the data are best described by α = 0.135+.033 –.017 and β = 3.19+0.14 – 0.24, where the error is dominated by the uncertainty in the form of the intrinsic scatter matrix. Our result depends on the introduction of a more general form for the intrinsic scatter of the distance moduli of SNe Ia than is conventional, resulting in a larger value of β and a larger uncertainty than the conventional approach. Although this analysis results in a larger value of β and a larger error, the SDSS data differ (at a 98% confidence level) from β = 4.1, the value expected for extinction by the type of dust found in the Milky Way. We have modeled the distribution of SNe Ia in terms of their color and conclude that there is strong evidence that variation in color is a significant contributor to the scatter of SNe Ia around their standard candle magnitude

AB - We describe a new formalism to fit the parameters α and β that are used in the SALT2 model to determine the standard magnitudes of Type Ia supernovae (SNe Ia). The new formalism describes the intrinsic scatter in SNe Ia by a covariance matrix in place of the single parameter normally used. We have applied this formalism to the Sloan Digital Sky Survey Supernova Survey (SDSS-II) data and conclude that the data are best described by α = 0.135+.033 –.017 and β = 3.19+0.14 – 0.24, where the error is dominated by the uncertainty in the form of the intrinsic scatter matrix. Our result depends on the introduction of a more general form for the intrinsic scatter of the distance moduli of SNe Ia than is conventional, resulting in a larger value of β and a larger uncertainty than the conventional approach. Although this analysis results in a larger value of β and a larger error, the SDSS data differ (at a 98% confidence level) from β = 4.1, the value expected for extinction by the type of dust found in the Milky Way. We have modeled the distribution of SNe Ia in terms of their color and conclude that there is strong evidence that variation in color is a significant contributor to the scatter of SNe Ia around their standard candle magnitude

U2 - 10.1088/0004-637X/740/2/72

DO - 10.1088/0004-637X/740/2/72

M3 - Article

VL - 740

SP - 72

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

ER -

ID: 113213